 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.cheatsheets.handlers;

 import org.eclipse.core.commands.AbstractHandler;
 import org.eclipse.core.commands.ExecutionEvent;
 import org.eclipse.core.commands.ExecutionException;
 import org.eclipse.jface.dialogs.InputDialog;
 import org.eclipse.jface.window.Window;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.PlatformUI;

 /**
  * A command handler to open an <code>InputDialog</code> and return the
  * result.
  *
  * @since 3.2
  */
 public class OpenInputDialogHandler extends AbstractHandler {

     private static final String PARAM_ID_TITLE = "title"; //$NON-NLS-1$

     private static final String PARAM_ID_MESSAGE = "message"; //$NON-NLS-1$

     private static final String PARAM_ID_INITIAL_VALUE = "initialValue"; //$NON-NLS-1$

     private static final String PARAM_ID_CANCEL_RETURNS = "cancelReturns"; //$NON-NLS-1$

     public Object execute(ExecutionEvent event) throws ExecutionException {

         String title = event.getParameter(PARAM_ID_TITLE);
         String message = event.getParameter(PARAM_ID_MESSAGE);
         String initialValue = event.getParameter(PARAM_ID_INITIAL_VALUE);

         IWorkbenchWindow activeWindow = PlatformUI.getWorkbench()
                 .getActiveWorkbenchWindow();
         Shell shell = (activeWindow != null) ? activeWindow.getShell() : null;

         InputDialog dialog = new InputDialog(shell, title, message,
                 initialValue, null);
         int returnCode = dialog.open();
         
         if (returnCode == Window.CANCEL) {
             String cancelReturns = event.getParameter(PARAM_ID_CANCEL_RETURNS);
             if (cancelReturns != null)
                 return cancelReturns;
             else
                 throw new ExecutionException("dialog canceled"); //$NON-NLS-1$
 }
         
         return dialog.getValue();
     }

 }

